摘要:
The object of the invention is to provide a favorable spectral characteristic that reduces variation depending on the frequency of received light intensity, and that is gentle on a subject eye. It also eliminates displacement between positions of respective spectral images of the same part even if a change in alignment occurs between the eye and apparatus with the lapse of time. An apparatus 1 for measuring spectral fundus image data of this invention comprises: an illumination optical system 10 having an illumination light source 11 that emits a light beam in a specified wavelength range; a light receiving optical system 20 for forming a fundus image on the light receiving surface of a photographing section 4; a liquid crystal wavelength tunable filter 32 capable of choosing a wavelength of a transmitted light beam in a specified wavelength range; a spectral characteristic correction filter 13 having wavelength characteristic for correcting the wavelength characteristic of the emitted light intensity of the illumination light source 11 and the transmission wavelength characteristic of the wavelength tunable filter 32 so that the received light intensity on the light receiving surface is kept within the specified range; and a data measuring section 7 for taking the spectral fundus image data from the light receiving surface while changing the wavelength of the light beam passing through the wavelength tunable filter 32.
摘要:
The object of the invention is to provide a favorable spectral characteristic that reduces variation depending on the frequency of received light intensity, and that is gentle on a subject eye. It also eliminates displacement between positions of respective spectral images of the same part even if a change in alignment occurs between the eye and apparatus with the lapse of time. An apparatus 1 for measuring spectral fundus image data of this invention comprises: an illumination optical system 10 having an illumination light source 11 that emits a light beam in a specified wavelength range; a light receiving optical system 20 for forming a fundus image on the light receiving surface of a photographing section 4; a liquid crystal wavelength tunable filter 32 capable of choosing a wavelength of a transmitted light beam in a specified wavelength range; a spectral characteristic correction filter 13 having wavelength characteristic for correcting the wavelength characteristic of the emitted light intensity of the illumination light source 11 and the transmission wavelength characteristic of the wavelength tunable filter 32 so that the received light intensity on the light receiving surface is kept within the specified range; and a data measuring section 7 for taking the spectral fundus image data from the light receiving surface while changing the wavelength of the light beam passing through the wavelength tunable filter 32.
摘要:
To provide a spectroscopic fundus measuring apparatus capable of identifying each part in spectral fundus images easily and accurately based on its spectral characteristic and a measuring method therefor. A spectral fundus image measuring apparatus 1 of the present invention includes: an illumination optical system 10 having an illumination light source 11 for illuminating a fundus; a light receiving optical system 20 for receiving a wavelength-tunable light beam reflected from the illuminated fundus to photograph a series of spectral fundus images of different wavelengths; an image processing section 7 for processing the spectral fundus images; a storage section 7A for storing the spectral fundus images; and a display section 7B for displaying the spectral fundus images. The image processing section 7 has a position correcting section 72 for correcting the series of spectral fundus images photographed by the light receiving optical system 20 to match the positions of the same parts therein, and an image extracting section 74 for extracting spectral fundus images in wavelength ranges predetermined for respective specific parts from the series of spectral fundus images corrected in the position correcting section 72.
摘要:
A model eye for an eye characteristic measuring device and a calibration method for the model eye. The model eye can have various aberrations and/or power characteristics to be formed by a combination of a refractive-type lens and a phase plate for adding aberration and can be used to confirm the accuracy of wavefront measurement or the like of the eye characteristic measuring device. The model eye includes an anterior eye lens forming a predetermined power to be given to the model eye, a diffusion surface diffusing and reflecting incident light, the diffusion surface being disposed at an image point position corresponding to the predetermined power in relationship to the anterior eye lens, and an aberration adding member giving a predetermined aberration to an area between the anterior eye lens and the diffusion surface. Power and aberration required for the model eye are formed by the anterior eye lens and the phase plate.
摘要:
Optical performance in a case where not only higher order aberrations but also lower order aberrations are added, are evaluated, lower order aberration quantities in which for example, a Strehi ratio is large and/or a phase shift is decreased, is calculated, and correction data, such as S, C and A, at that time is obtained, so that a result closer to a subjective value is obtained. An arithmetic part receives measurement data indicating a refractive power distribution of a subject eye and obtains lower order aberrations and higher order aberrations on the basis of the measurement data (S401, S403). The arithmetic part judges whether the higher order aberrations have a specified value or higher (S405). The arithmetic part changes, in a case where the higher order aberrations have the specified values or higher, lower order aberration quantities corresponding to the higher, lower aberrations having the specified values or higher, obtains appropriate correction data suitable for the subject eye (S407 to S417), and obtains the correction data (S419).
摘要:
Scattering can be measured by using an optical system having a Hartman-Shack wave-surface sensor. An eye optical characteristic measuring instrument comprises a light source unit 10 for emitting a light beam of a wavelength in the near-infrared region, an illumination optical system 40 for illuminating a small area of the retinal of an eye to be measured with the light beam from the light source unit 10, a light-receiving optical system 20 for receiving a part of the reflected beam of the light beam from the light source unit 10 reflected from the retina through a converting member for converting the part of the reflected light beam into at least substantially 17 light beams, a light-receiving section 23 for receiving the received light beam directed by the light-receiving optical system 20 and generating a signal, and a calculating unit for determining the wavefront aberration of the light beam entering the light-receiving optical system 20 and the degree of scattering of the received light beam on the basis of the signal from the light-receiving section 23.
摘要:
A subject is placed in a more natural state or is encouraged to blink at specified intervals to obtain a measurement result under a fixed condition, and the judgment of the degree of dry eye is facilitated. A measurement part obtains, based on a reflected light flux from a subject eye, optical characteristic data of a two-dimensional vector form representing the time course of each optical characteristic of the subject eye in an blink interval from a certain blink to a next blink with respect to the first to the nth blink intervals. An analysis part one-dimensionally arranges each of the optical characteristic data with respect to the first to the nth blink intervals measured by the measurement part, and arranges the one-dimensional arrangement of the optical characteristic in a p-th blink interval at a p column to create a two-dimensional array, and performs a principal component analysis processing on the two-dimensional array.
摘要:
A visual target presenting optical system has a light source that illuminates a visual target to be viewed by a subject, and a visual target presentation state changing unit that can change the direction in which the visual target will be presented to the subject. An alignment luminous flux casting unit casts an alignment luminous flux toward a subject eye at timing prior to the presentation of the visual target. An alignment light receiving optical system and a light receiving unit receive a reflected luminous flux from the subject eye reflecting the luminous flux. A change control unit instructs the visual target presentation state changing unit to change the visual target presenting direction on the basis of the light receiving position of the reflected luminous fluxes received by the light receiving unit.
摘要:
Measurement data (measured results) obtained under a plurality of conditions and image data and/or numerical data corresponding to the measured results are displayed collectively or selectively. An optical characteristics measuring device (100) measures/displays, for example, the optical characteristics of an eye to be measured (60) as an object. A first lighting optical system (10) includes a first light source (11) for applying an optical flux of a specified pattern to the eye to be measured (60). A first light receiving optical system (20) includes a first light receiving unit (23) for receiving light reflected from the eye (60). A light transmitting/receiving optical system (30) mainly conducts an alignment adjustment, and includes a second light receiving unit (35) for receiving light reflected from the eye (60). A common optical system (40) is disposed on the optical axis of a light flux emitted from the first lighting optical system (10), and is commonly included in the first lighting.
摘要:
To provide a spectroscopic fundus measuring apparatus capable of identifying each part in spectral fundus images easily and accurately based on its spectral characteristic and a measuring method therefor. A spectral fundus image measuring apparatus 1 of the present invention includes: an illumination optical system 10; a light receiving optical system 20 for photographing a series of spectral fundus images of different wavelengths; an image processing section 7 for processing the spectral fundus images; a storage section 7A; and a display section 7B. The image processing section 7 has a position correcting section 72 for correcting the series of spectral fundus images to match the positions of the same parts therein, and an image analyzing section 73 for calculating the spectral characteristic of each part in the spectral fundus images based on the series of spectral fundus images corrected in the position correcting section 72. The storage section 7A stores the spectral characteristics of the parts together with standard spectral characteristics of specific parts. The image processing section 7 has a first grouping section 74A for comparing the spectral characteristic of each part with the standard spectral characteristics of the specific parts to divide the parts into groups corresponding to the specific parts.